Pull-switch socket



Oct; 13, 1925- 1,556,652

, I c. E.-wARNI-: R

' I FULL SWITCH socxm Filed Sept. 7,1920 2 Sheets-Sheet i Oct. 13,1925- Filed Sept. 1920 2 Sheets-Sheet 2 I fi um u m Patented Oct. 13, 1925.

UNITED STATES PATENT OFFICE;

CHESTER E. WARNER, or nnnwyn, mime Assrenon To BENJAMIN ELECTRIC MANUFACTURING coMrAnY, FcHIOAGo, rumors, A CORPORATION on ILLINOIS.

rULL-swITcH SOCKET.

I Application filed September 7, 1920. Serial No. 408,579.

To all whom it may concern:

Be it known that I, CHEsTER E. WARNER,

a citizen of the United States, residing at Berwyn, in the county of Cook and State of Illinois, have invented new and useful Improvements in Pull-Switch Sockets, of which the following is a full, clear, concise,

and exact description, reference being hadv to the accompanying drawing, forming a of which engages the flange 19, (F ig. 3) of part of this specification,

My "nvention relates to electrical 'con-' nector devices and more specifically to pull switch sockets.

One of the objects of my invention is to provide an improved pull swatch socket,

which will be durable and eflicient in opera tion, simple in construction and easy to as semble.

Further objects will appear from the dc tailed description to follow and from the appended claims. I

In the drawings, in which one embodiment of my invention is shown; I Fig. 1 isa top planview of anangle pull V switch socket having the cap removed;

Fig. 2 isa section on the line 22 of Fig. 1; v I

Fig.3 is a section on the line 3- 3 of .Fig.5; v Fig. 4 is asection on the line 44 of Fig. 5 is a section on the line 5-5 of Fig. 1; I f

Fig. 6 is a section on the line 6-6 of Fig.2;

F ig; 7- is a detail perspective view of part of the switch mechanism; I k v I Fig. 8 is a section on the line 88 of ;v

Fig. 9 is asection on the line 99 of Fig, 2; and i a Fig. 10 is a section on the line 1010'of Fig. 2. V I

he angle pull switch socket shown in the drawing comprises in a general 'way, shell and center contacts 10 and 11 for enga ement with the contacts of an insertible vice, wiring terminals-12' and 13 for the contacts 10' and 11 respectively, a pull switch mechanism 14 for controlling, the circuit between the center contact 11 and wiring terminal 13, a substantially cylindrical insulating base :for supporting the contacts 10 and 11, the wiring terminals 12 and p r 13, and the switch mechanism 14, and providing the necessary insulation therebetween,and a sheet metal shell casing 16 sur-- rounding the insulating base 15 and threaded shell contact 10.- An insulating fibre cup or sleeve 17 is provided between the shell; contact 10 and casing 16.

The threaded shell contact 10 is always electrically connected with its wiring terminal- 12-, by means of a screw 18, the head the threaded shell contact, and the shank of whlch is'threaded into the binding plate 20 (Fig. 1) ofthe wiring terminal 12.

The switch mechanism" 14 controls the circuit between the yielding cont-act mem-;

bore 21 and 22" (Fig. 8) the yielding contact 22 being always electrically connected with the center contact 11 by means of the tubular eyelet 23, the other yielding contact 21 being always electrically connected with the wiring terminal 13, by means of a. screw 24, which is threaded into the' binding plate '25 of the wiring terminal 13, to clamp thebinding plate down against the base of the spring contact 21, andfirmly hold the binding plate and spring contactin place from the insulating base 15. The screw 23 not only serves to electricallyconnect the spring contact 22 and center contact 11, but also serves to hold theseparts in place on the in-- sulating base.

.The switch mechanism 14fis located in a recess 26 in the insulating base 15. This switch mechanism comprises a U-shaped switch arm or blade 27 of conducting material, oscilla tablev about an axis parallel to the axis of the socket, and movable into and out of engagement with respect to the yields ing contacts 21 and 22, a .coil compression spring 28 bearing'onthe end of the switch I blade 27,. and shiftable pasta dead center,

line to cause-a quick action of the switch arm 27, a swing shifting link 29 surrounded by the spring 28 and havingone end slidable" in a slot 30 in the U-shaped switch arm 27, a rotatable barrel-cam 31 having an elliptical groove 32 for engagement with one end of the spring shifting link 29,121. pull chain 33 for operating the switch mechanism, a switch lever 34 to'which the pull chain 33 is secured, ratchet mechanism 35 whereby the oscillating movement of the switch lever 34 causes a step-by-step rotary movement oi 'the'barrel-cain 31 to cause oscillation of the. switch arm 27, and a switch frame 36 which may be an integral sheet metal stamping, supporting the switch arm 2?, the lever 34 and the various other parts of the switch mechanism associated therewith. The elliptical groove 32' may be considered as comprising two helical cam track portions, one of which shifts the link 29 in one direction and the other of which shifts the link in the other direction.

For returning the switch lever 34 after it has been operated by the pull chain 33, a coil torsion spring 37 is provided, one end of which is connected to the switch frame at 38, and the other .end of which is connected at 39 (Figs. 2 and 3) to an insulating disc 40, forming part of the lever. The switch frame 36 is secured in place in the recess by means of a screw 41, extending through an opening in the insulating base 15 and threaded into the base of the switch frame. The switch arm 27 is supported in its movement of oscillation by means of a pivot pin 42 mounted in ears l3 .of the switch frame 36, and extending through openings in the arms of the U-shaped switch blade 27. The lever 34 and the barrel-cam 31 are mounted for movements of oscillation and step-by-step rotation on .a switch shaft 44 mounted in the switch frame .36.

The groove 32 in thebarrelscam3l is a continuous elliptical groove so that the continuous step-by-step rotation of the barrel-cam 31 through a complete rotation of 3,60 degrees brings the spring shifting link 29 back to the point from which it started. The construction of the ratchet .35 is such that .each operation of the pull chain .33 will cause the barrel-cam 31 to move through 180 degrees, to shift the swinging spring shifting link 29 from one extreme position to the other to cause the pivoted switch blade 2.? to move from off to on position, or vice-versa.

The spring shifting link 29 is pnovided with, a central projection or lug 45, which extends into the elliptical groove .32, this lug 45 remaining in the groove 32 as the barrelcam 31 is rotated, and causing the shifting of the link. In order to keep the link 29 from slipping off sideways, it is provided with arms 46 (Fig. 5) which embrace the barrel-cam. These arm s do not engage in the groove, as neither arm is ever in alignment with the plane of the groove .32, during any part of the movement of the barrel-cam.

As shown in F ig. 9, thearms .of-the switch blade 27 straddle the barrel-cam, the switch blade 27 in its middle position lying 'SllbSttlEb tially in a plane perpendicular to the axis of the barrel-cam, .one ,end .of the spring shifting member 29 having a movement along a line parallel to the axis of the barrelcam and of the switch lever or chain rail 34.

The ratchet mechanism 35 comprises a disc ratchet member 47 (which may be integral with the barrel-cam 31) having ratchet teeth &8 which cooperates with ratchet depressions e9, in the fibre disc 40.

I The pull chain 33 is secured to a hook- .shaped portion 50 of the chain rail which forms part of the lever. For limiting the return movement of the pull chain under the action of the return spring 37, a lug or stop '51 is struck up from the switch frame 36, in position to he engaged by the hook member 50 on the return movement of the chain rail (Fig. 10). The chain rail is secured to the fibre disc 40 by means of lug 52 integral with the stam ing from which the chain rail is formed anc bent over the edge of the disc 40 into recesses in the disc. (Figs. 2 and .6).

To operate the switch the pull chain 33 is pulled down .to move the switch lever 34 through 180 degrees, causing a corresponding movement of the barrel-cam 31 through the ratchet mechanism 35. This movement of the barrel-cam 31 through 180 degrees shifts the spring shifting link 29 from one extreme position to the other and shifts the switch arm 27 from off to on position or vice-versa, the movement of the switch arm 27 on to the swinging link after the spring shifting member 29 has passed the dead center line being effected, under the action of the. compressed spring 28.

While I have shown but one embodiment of my invention, it may be embodied in other forms as covered and defined by the appended claims.

What I claim as new and desire to secure by Letters Patent of the United States 1s:

1. A pull switch socket comprising an oscillatable switch blade, a spring bearing on said switch blade, a spring shifting member for shifting said spring past a dead center to cause oscillation of the switch blade, an oscillatable switch lever and means for shifting said spring shifting member substantially longitudinally of the axis of said switch lever, said means comprising a cylindrical cam coaxial with said switch lever, said cylindrical cam having an elliptical groove in its cylindrical surface.

2. A switch comprising a pivoted switch blade :oscillatable back and forth, means for causing said switch blade to oscillate back and forth, comprising a rotatable cylindrical cam having an oval cam track on its cylindrical surface and rotatable therewith, said switch blade in its middle position lying substantially in a plane perpendicular to the axis of said cylindrical cam.

3. A switch comprising a U-shaped switch blade oscillatable back and forth, means for causing said switch blade to oscillate back and forth comprising a cylindrical barrelspring acting on said switch blade, and means for shifting said spring back and forth to cause oscillation of the switch blade switch blade oscillatable back and forth, a

spring acting on said switch blade, and means for shifting said spring back and forth to cause oscillation of the switch blade comprising a rotatable member having a cylindrical surface provided with a cam track having a helical portion and a ratchet member coaxial with said cylindrical cam member for actuating it.

6. A switch mechanism comprising a switch blade oscillatable back and forth, a spring acting on said switch blade, and means for shifting said spring back and forth to cause oscillation of the switch blade comprising a rotatable member having a cylindrical surface provided with a cam track having a helical portion lying substantially on one semi-cylindrical portion of the cylindrical member, and a helical portion lying on the other semi-cylindrical portion of the cylindrical member, the two helical portions being continuous with each other to form a continuous track around the cylindrical member. whereby each half revolution of the cylindrical member causes oscillation of the switch blade.

In witness whereof, I have hereunto subscribed my name.

CHESTER E. WARNER. 

